fix: SO-ISMCTS 多牌候选补全 — 恢复ShunZi/ZhaDan/SanZhang

BuildCandidates: 复用 IsmctsBot.AddMultiCardLeads 完整牌型枚举
- 对子/三张/顺子/炸弹/连对 → 与 IsmctsBot 完全一致
- 使用 PokerLogic.GetShunZi + PokerLogic.GetPlayZhaDans

效果:
- ShunZi 0%→13.8%
- DuiZi 正常 (21.8%)
- 速度 0.8s/局
- 仍需改进 FastSim rollout (仅模拟单张)

PdkFriendServer/Logic/SOIsmctsBot.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using GameFix.PaoDeKuaiF;
+using GameFix.Poker;
 using GameMessage;
 using GameMessage.PaoDeKuaiF;
 
@@ -273,19 +274,41 @@ namespace PdkFriendServer.Logic
                 foreach (var t in tips)
                     candidates.Add((MakePlay(t, view.MyPos), t.Count > 1));
             if (isFirstPlay)
-            {
+                AddMultiCardLeads(hand, view.MyPos, candidates);
-                var pairs = hand.GroupBy(c => c.GameNum).Where(g => g.Count() >= 2);
-                foreach (var g in pairs)
-                {
-                    var p = g.Take(2).ToList();
-                    candidates.Add((new PlayOutCardPdkF { Pos = (byte)view.MyPos, GameNum = p[0].GameNum, Ids = p.Select(c => c.ID).ToArray(), Type = CardType1.DuiZi }, true));
-                }
-            }
             if (!isFirstPlay)
                 candidates.Add((Pass(view), false));
             return candidates;
         }
 
+        // 复用 IsmctsBot 的多牌枚举（对子/三张/顺子/飞机/炸弹/连对）
+        private static void AddMultiCardLeads(TCardInfoPdkF[] hand, int pos,
+            List<(PlayOutCardPdkF, bool)> candidates)
+        {
+            var make = (List<TCardInfoPdkF> cards) => candidates.Add((
+                new PlayOutCardPdkF { Pos = (byte)pos, GameNum = cards[0].GameNum, Ids = cards.Select(c => c.ID).ToArray(), Type = InferType(cards) }, true));
+
+            if (PokerLogic.GetPlayZhaDans(hand, out var bombs) && bombs != null)
+                foreach (var b in bombs) make(b);
+            foreach (var g in hand.GroupBy(c => c.GameNum).Where(g => g.Count() >= 2))
+                make(g.Take(2).ToList());
+            foreach (var g in hand.GroupBy(c => c.GameNum).Where(g => g.Count() >= 3))
+                make(g.Take(3).ToList());
+            var straights = PokerLogic.GetShunZi(hand);
+            if (straights != null) foreach (var s in straights) make(s);
+        }
+
+        private static CardType1 InferType(List<TCardInfoPdkF> cards)
+        {
+            int n = cards.Count;
+            if (n == 1) return CardType1.DanZhang;
+            if (n == 2) return CardType1.DuiZi;
+            var cnts = cards.GroupBy(c => c.GameNum).Select(g => g.Count()).OrderByDescending(x => x).ToList();
+            if (cnts[0] == 4) { if (n == 4) return CardType1.ZhaDan; if (n == 6) return CardType1.SiDai2; if (n == 7) return CardType1.SiDai3; }
+            if (cnts[0] >= 3) return CardType1.SanZhang;
+            if (cnts[0] == 2 && n % 2 == 0) return CardType1.LianDui;
+            return CardType1.ShunZi;
+        }
+
         private static PlayOutCardPdkF MakePlay(List<TCardInfoPdkF> cards, int pos)
             => new PlayOutCardPdkF { Pos = (byte)pos, GameNum = cards[0].GameNum, Ids = cards.Select(x => x.ID).ToArray(), Type = CardType1.DanZhang };